Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/go/chapter_backtracking/n_queens_test.go

@@ -0,0 +1,24 @@
+// File: n_queens_test.go
+// Created Time: 2023-05-14
+// Author: Reanon (793584285@qq.com)
+
+package chapter_backtracking
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestNQueens(t *testing.T) {
+	n := 4
+	res := nQueens(n)
+
+	fmt.Println("入力された盤面の縦横は ", n)
+	fmt.Println("クイーンの配置パターンは ", len(res), " 通り")
+	for _, state := range res {
+		fmt.Println("--------------------")
+		for _, row := range state {
+			fmt.Println(row)
+		}
+	}
+}